OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

RT9742DGJ5

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
RT9742
4
DS9742-07 June 2017www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Operation
Charge Pump and Drivers
An internal charge pump supplies power to the driver circuit
and provides the necessary voltage to pull the gate of the
MOSFET above the source. The driver controls the gate
voltage of the power switch.
Current Limit
The RT9742 continuously monitors the output current for
over-current protection to protect the system power, the
power switch, and the load from damage during output
short circuit. When an overload or short circuit occurs,
the current-sense circuitry sends a control signal to the
driver. The driver reduces the gate voltage and drives the
power MOSFET into its saturation region, which switches
the output into a constant-current mode and holds the
current constant until the thermal shutdown occurs or the
fault is removed.
TSOT-23-5 Package (For RT9742M Only)
Under-Voltage Lockout
A voltage-sense circuit monitors the input voltage. When
the input voltage is above 2.4V, UVLO turns on the
MOSFET switch.
Thermal Shutdown
The RT9742 continuously monitors the operating
temperature of the power switch for over-temperature
protection. The RT9742 turns off the power switch to
prevent the device from damage if the junction temperature
rises to approximately 140°C due to over-current or short-
circuit conditions. The pass element turns on again after
the junction temperature cools to 120°C.
FLAG
The RT9742 pulls low the open drain output FLAG after
over current or over temperature condition occurring over
approximately 10ms.
Output Voltage
Detector
Gate
Control
VOUT
Charge
Pump
VIN
Bias
GND
Current
Limiting
UVLO
Thermal
Protection
Oscillator
VOUT
EN
Auto
Discharge
RT9742
5
DS9742-07 June 2017 www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Absolute Maximum Ratings (Note 1)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- 7V
EN Voltage ------------------------------------------------------------------------------------------------------------------ −0.3V to 7V
FLAG Voltage -------------------------------------------------------------------------------------------------------------- 7V
Power Dissipation, P
D
@ T
A
= 25°C
TSOT-23-5 ------------------------------------------------------------------------------------------------------------------- 0.49W
TSOT-23-5 (FC) ------------------------------------------------------------------------------------------------------------ 0.79W
SOT-23-3 -------------------------------------------------------------------------------------------------------------------- 0.41W
Package Thermal Resistance (Note 2)
TSOT-23-5, θ
JA
------------------------------------------------------------------------------------------------------------- 203°C/W
TSOT-23-5 (FC), θ
JA
------------------------------------------------------------------------------------------------------ 126.5°C/W
SOT-23-3, θ
JA
--------------------------------------------------------------------------------------------------------------- 243.3°C/W
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions (Note 4)
Supply Input Voltage, VIN ----------------------------------------------------------------------------------------------- 2.7V to 6V
EN Voltage ------------------------------------------------------------------------------------------------------------------ 0V to 6V
Junction Temperature Range --------------------------------------------------------------------------------------------
−40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(V
IN
= 5V, C
IN
= 10μF, C
OUT
= 0.1μF, T
A
= 25°C, unless otherwise specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Input Quiescent Current I
Q
Switch on, V
OUT
= open -- 30 40
A
Input Shutdown Current I
SHDN
V
IN
= 5V, no load on OUT, device
OFF, V
EN
= 0V or
EN
V = 5V
-- 0.1 1
Switch On
Resistance
RT9742XXJ5F
R
DS(ON)
-- 55 --
m
RT9742XXJ5/V -- 70 --
Over Current
Trip Threshold
(Note 5)
RT9742Q/R/S
I
TRIP
V
IN
= 5V, 100A/s
0.65 0.89 1
A
RT9742G/H/L 1.05 1.4 1.5
RT9742E/F/K/M/U 1.55 2.1 2.25
RT9742C/D/J 2.05 2.8 3
RT9742N/P 2.55 3.5 3.75
RT9742A/B 3.05 4.2 4.5
RT9742
6
DS9742-07 June 2017www.richtek.com
©
Copyright 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
Note 1. Stresses beyond those listed “Absolute Maximum Ratings” may cause permanent damage to the device. These are
stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions may affect
device reliability.
Note 2. θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
Note 3. Devices are ESD sensitive. Handling precaution is recommended.
Note 4. The device is not guaranteed to function outside its operating conditions.
The thermal shutdown protection will react at high Ambient Temperature or low V
IN
due to R
DS(ON)
variation.
Please refer to Application Information and Typical Operating Characteristics.
Note 5. For a specific sample, Current Trip Threshold (I
TRIP
) is always higher than Current Limit Threshold (I
LIM
).
Parameter Symbol Test Conditions Min Typ Max Unit
Current
Limit
RT9742Q/R/S
I
LIM
V
OUT
= 1V
0.6 0.7 0.8
A
RT9742G/H/L 1 1.1 1.2
RT9742E/F/K/M/U 1.5 1.65 1.8
RT9742C/D 2 2.2 2.4
RT9742N/P 2.5 2.75 3
RT9742A/B 3 3.3 3.6
RT9742J 1.8 2.15 2.5
EN/EN Threshold
Logic_High Voltage V
IH
V
IN
= 2.7V to 6V 1.5 -- --
V
Logic_Low Voltage V
IL
V
IN
= 2.7V to 6V -- -- 0.75
EN/EN Input Current
EN/EN
I
V
EN
= 0V,
EN
V = 5V 0.5 -- 0.5 A
Output Leakage Current I
LEAKAGE
V
EN
= 0V, R
LOAD
= 0 -- 0.5 1 A
Reverse Leakage Current I
REV
V
OUT
= 5V, V
IN
= 0V -- -- 1 A
Reverse Voltage Trip Point V
REV
V
OUT
V
IN
-- 200 -- mV
Output Turn-On Rise Time t
ON_RISE
10% to 90% of V
OUT
rising -- 1.5 -- ms
Turn-On Time t
ON
From enable to 90% of V
OUT
-- 2.1 -- ms
Output ResistFLG ance
FLG
R
I
SINK
= 1mA -- 10 --
FLG Off Current
FLG_OFF
I
FLG
V = 5V
-- 0.01 1 A
FLG Delay Time t
D
From fault condition to
FLG
assertion
-- 10 -- ms
Shutdown Auto-Discharge Resistance R
Discharge
V
EN
= 0V, V
EN
= 5V -- 100 --
Under-Voltage Lockout V
UVLO
V
IN
rising -- -- 2.4 V
Under-Voltage Hysteresis V
UVLO
V
IN
decreasing -- 0.1 -- V
Thermal Shutdown Protection T
SD
-- 140 -- °C
Thermal Shutdown Hysteresis T
SD
-- 20 -- °C
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

RT9742DGJ5

Mfr. #:
Buy RT9742DGJ5
Manufacturer:
Description:
IC USB POWER SWITCH TSOT23-5
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet